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최민석(Minsuk Choi),백제현(Jehyun Baek) 한국유체기계학회 2004 유체기계 연구개발 발표회 논문집 Vol.- No.-
A three-dimensional computation was conducted to understand effects of the inlet boundary layer thickness on the loss mechanism in a low-speed axial compressor operating at the design condition(φ=85%) and near stall condition(φ=65%). At the design condition, the flow phenomena such as the tip leakage flow and hub corner stall are similar independent of the inlet boundary layer thickness. However, when the axial compressor is operating at the near stall condition, the large separation on the suction surface near the casing is induced by the tip leakage flow and the boundary layer on the blade for thin inlet boundary layer but the hub corner stall is enlarged for thick inlet boundary layer. These differences of internal flows induced by change of the boundary layer thickness on the casing and hub enable loss distributions of total pressure to be altered. When the axial compressor has thin inlet boundary layer, the total pressure loss is increased at regions near both casing and tip but decreased in the core flow region. In order to analyze effects of inlet boundary layer thickness on total loss in detail, using Denton's loss models, total loss is scrutinized through three major loss categories in a subsonic axial compressor such as profile loss, tip leakage loss and endwall loss.
최민석(Minsuk Choi),박민우(Minwoo Park),장경호(Kyungho Jang),정순기(Soonki Jung) 한국정보과학회 2009 한국정보과학회 학술발표논문집 Vol.36 No.1C
하나의 긴 장면의 영상은 그 장면을 촬영한 여러 개의 단일 영상들을 정합하여 만들어 진다. 다중 시점(multi-perspective) 영상은 시점이 다른 곳에서 촬영된 영상들을 합쳐 하나의 영상 내에서 여러 시점표현을 가능하게 한 영상이다. 그러므로 다중 시점 영상을 생성하면 물체에 대한 전체적인 모습을 한 장의 영상으로 파악할 수 있다. 다중 시점 영상 생성에서 중요한 문제 중의 하나는 다중 시점의 영상을 어떻게 배치하느냐 하는 것이다. 이는 곧 가상 시점을 어떻게 하느냐의 문제와 동일하다. 또한 생성된 영상의 시점을 사용자가 임의로 수정하는 기능을 부여하였다. 본 논문에서 제시한 사용자 입력 기반의 방법은 기존의 다중 시점 영상생성에 소요되는 시간을 대폭 줄일 수 있고, 사용자가 원하는 임의의 깊이 값을 가지는 다중 시점 영상을 얻을 수 있다.
최민석(Minsuk Choi),백제현(Je Hyun Baek),오성환(Seong Hwan Oh),고한영(Han Young Ko) 한국전산유체공학회 2007 한국전산유체공학회 학술대회논문집 Vol.2007 No.-
A three-dimensional computation was conducted to understand effects of the low Reynolds number on the performance in a low-speed axial compressor at the design condition. The low Reynolds number can originates from the change of the air density because it decreases along the altitude in the troposphere. The performance of the axial compressor such as the static pressure rise was diminished by the separation on the suction surface and the boundary layer on the hub, which were caused by the low Reynolds number. The total pressure loss at the low Reynolds number was found to be greater than that at the reference Reynolds number at the region from the hub to 90% span. Total pressure loss was scrutinized through three major loss categories in a subsonic axial compressor such as profile loss, tip leakage loss and endwall loss using Denton's loss model, and effects of the low Reynolds number on the performance were analyzed in detail.
동익 회전속도 변화에 따른 1단 축류 압축기 선회실속의 특성변화 연구
최민석(Minsuk Choi),백제현(Je-Hyun Baek) 한국유체기계학회 2002 유체기계 연구개발 발표회 논문집 Vol.- No.-
A numerical analysis using 2-D unsteady compressible program is conducted to explain characteristics of rotating stall such as rotating speed and number of stall cells in an one-stage axial compressor. Unlike an axial compressor which has only a rotor, in one-stage axial compressor a rotating stall is generated by rotor/stator interaction and back pressure rising without any artificial disturbance and modeling. As a back pressure is raised, the separation of suction side at blades is increased uniformly, but because of the discrepancy of blockage effect by stator, the disturbances are generated to form a stall cell. Once the stall cell is formed, regularly the stall cell are rotating through rotor blades. When the speed of rotor is design speed, the rotating speed of stall cell is 83.3% of rotor rotating speed. When the speed of rotor is 88% of design speed, the speed of rotating stall is 88.2 % of rotor speed. The number of generated stall cell are also varied for rotor speed and back pressure.